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​​​​​​​Suppose $P, Q$ and $R$ are co-operating processes satisfying Mutual Exclusion condition. Then, if the process $Q$ is executing in its critical section then

  1. Both $‘P’$ and $‘R’$ execute in critical section
  2. Neither $‘P’$ nor $‘R’$ executes in their critical section
  3. $‘P’$ executes in critical section
  4. $‘R’$ executes in critical section
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Mutual execution means only one process can enter the critical section at a time so when Q is in the critical section no other process can be in critical section.

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